(Topic ID: 272477)

No Coils or Controlled Lights on The Shadow

By RCA1

3 years ago


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#1 3 years ago

Hadn't played my Shadow in a while, and when I turned it on it seemed to boot OK, but it's not working.

Here's what I have:
GI is on.
Will start a game (without kicking out a ball)
Flippers work.
Sound works.
Board indicator LEDs seem correct.
No coils, game or test
No flashers, game or test
No controlled lights, game, test, or attract.
I get a single "bong" during startup, but the mini-playfield paddle does not move.

Things I have treid:
Factory reset
Reseated ribbon cables and power connections to MPU and driver board
All fuses checked with meter
Driver board TPs with meter. 50V is more like 70, everything else really close.

What next? MPU or driver problem?

Any help appreciated. Maybe The Shadow knows........

1 week later
#3 3 years ago
Quoted from grumppy:

Does it think the coin door is open? Check in switch edge test.

Thanks. Checked the coin door switch, and it works correctly in test. If I have a game started and open the door, I get the high power disabled message. So pretty sure that's not the problem.

Anyone have other thoughts?

It was suggested trying another driver board in the Shadow thread.
My Dirty Harry came with a Rottendog replacement driver board in it. Is that compatable, and should I try swapping that over to The Shadow?

#5 3 years ago
Quoted from LTG:

The high power switch only cuts high power, it doesn't put the message up. The other switch, the memory protect switch puts the message up.
So your high power switch may not be working. Busted, wires off, wires not in the right spots.
LTG : )

Thanks Lloyd!
I'll check that.

#6 3 years ago

Checked the high power cut out switch for continuity.
Works correctly both at the coin door, and getting continuity/not correctly back to the connector to the driver board at J102.
I'm learning stuff anyway, since I did not understand that the memory protect and high power switches were wired separately.

Any other ideas?
I may try swapping driver boards this weekend, if nothing else.

#8 3 years ago

Yes, checked all the fuses by meter, out of the holders. Checked most again while checking the interlock switches.
I was really hoping it was just a fuse.
The 50V test point was reading about 70V. Not sure if that's too high or not. The other test points were pretty much right on.

#12 3 years ago
Quoted from DumbAss:

Try giving the square IC in the middle of the CPU board (U9 - the CPU ASIC) a firm push. You can pull and re-seat it if you have the appropriate tool.

The asic chip is seated tightly. Didn't move at all when pushed.

Also have the same 70v at the coils as at the test point.

Checked a couple other things. Swapped out the MPU/driver ribbon cable. Checked continiuty on the Mpu/driver/power supply harness.

I'm now thinking it's an MPU problem and not a driver issue. I can swap drivers with Dirty Harry, but doubting that's worthwhile.
Can I swap MPUs without swapping chips, or is that a bad idea?
Any thoughts? Other things to test?

#13 3 years ago

Adding a couple pics as requested.

20200720_175200 (resized).jpg20200720_175200 (resized).jpg20200720_175204 (resized).jpg20200720_175204 (resized).jpg20200720_175223 (resized).jpg20200720_175223 (resized).jpg20200720_175227 (resized).jpg20200720_175227 (resized).jpg
#16 3 years ago

Board will be visiting Mr. Hibler for repairs.
Thanks Chris!

"Who knows what evil lurks in the heart of my driver board?"
Chris Hibler knows!

1 week later
#17 3 years ago

Shadow is back up and running again!
Huge shout out to Chris Hibler for diagnosing the problem here, and for his board repair service.
Repair was done very quickly and professionally.
Thanks Chris!

Also, mini shout out to USPS delivery was really quick both ways.

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